<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>导航栏点击效果</title>
    <link rel="stylesheet" href="./css/index.css" />
  </head>
  <body>
    <ul class="menu">
      <li>item1</li>
      <li class="active">item2</li>
      <li>item3</li>
      <li>item4</li>
      <li>item5</li>
    </ul>
    <script src="./js/index.js"></script>
  </body>
</html>
